package com.xinnet.mms.shirosecurity.service.impl;
import java.io.Serializable;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;

import javax.annotation.PostConstruct;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.shiro.authc.AuthenticationException;
import org.apache.shiro.authc.AuthenticationInfo;
import org.apache.shiro.authc.AuthenticationToken;
import org.apache.shiro.authc.SimpleAuthenticationInfo;
import org.apache.shiro.authc.UsernamePasswordToken;
import org.apache.shiro.authc.credential.HashedCredentialsMatcher;
import org.apache.shiro.authz.AuthorizationInfo;
import org.apache.shiro.authz.SimpleAuthorizationInfo;
import org.apache.shiro.realm.AuthorizingRealm;
import org.apache.shiro.realm.Realm;
import org.apache.shiro.subject.PrincipalCollection;
import org.springframework.beans.factory.InitializingBean;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.util.Assert;

import com.google.common.base.Objects;
import com.xinnet.mms.entity.Emp;
import com.xinnet.mms.entity.Resources;
import com.xinnet.mms.login.service.EmpService;
import com.xinnet.mms.login.service.impl.EmpServiceImpl;
import com.xinnet.mms.resources.service.ResourcesService;
import com.xinnet.mms.web.CustomerManageController;
//@Component
public class ShiroDbRealm extends AuthorizingRealm implements Realm,InitializingBean{
	
	public static final String HASH_ALGORITHM = "SHA-1";
	public static final int HASH_INTERATIONS = 1024;
	private static final int SALT_SIZE = 8;
	private static Log log = LogFactory.getLog(ShiroDbRealm.class);
	protected EmpService empService;
	
	@Autowired
	public void setEmpService(EmpServiceImpl empService) {
		this.empService = empService;
	}
	@Autowired
	protected ResourcesService resourcesService;
	
	public void setResourcesService(ResourcesService resourcesService) {
		this.resourcesService = resourcesService;
	}
	
	@Override
	public void afterPropertiesSet() throws Exception {
		// TODO Auto-generated method stub
		Assert.notNull(empService);
		Assert.notNull(resourcesService);
		
	}

	/**
	 * 认证回调函数,登录时调用.
	 */
	@Override
	protected AuthenticationInfo doGetAuthenticationInfo(AuthenticationToken authcToken) throws AuthenticationException {
		SimpleAuthenticationInfo info = null;  
		UsernamePasswordToken token = (UsernamePasswordToken) authcToken;
		Emp emp = empService.queryEmpByLoginName(token.getUsername());
		if (emp == null) {
			throw new AuthenticationException();
		}
//		byte[] salt = EncodesUtil.decodeHex(emp.getSalt());
		String loginName = emp.getLoginName();
		String passwordStr = emp.getPassword();
		char[] password =  passwordStr.toCharArray();
		info = new SimpleAuthenticationInfo(loginName,password, getName());
		log.info("认证回调函数执行完成ename="+ emp.getEname());
		return info;
	}

	/**
	 * 授权查询回调函数, 进行鉴权但缓存中无用户的授权信息时调用.
	 */
	@Override
	protected AuthorizationInfo doGetAuthorizationInfo(PrincipalCollection principals) {
		String loginName =(String) principals.fromRealm(getName()).iterator().next();  
        Emp emp = empService.queryEmpByLoginName(loginName);  
        if (emp == null) {  
        	return null;
        }
    	String roleId = emp.getRolId()+"";
    	List<String> resourcesRemarkList = new ArrayList<String>();
    	List<Resources> resourcesList = resourcesService.getResourcesListByRoleId(roleId);
    	if(resourcesList!=null && resourcesList.size()>0){
        	for (Iterator<Resources> iterator = resourcesList.iterator(); iterator.hasNext();) {
    			Resources resources = (Resources) iterator.next();
    			String  remark = resources.getRemark();
    			resourcesRemarkList.add(remark);
    			
    		}
    	}
    	SimpleAuthorizationInfo info = new SimpleAuthorizationInfo();  
    	info.addStringPermissions(resourcesRemarkList);  
        return info;  
	}

	/**
	 * 设定Password校验的Hash算法与迭代次数.
	 */
//	@PostConstruct
//	public void initCredentialsMatcher() {
//		HashedCredentialsMatcher matcher = new HashedCredentialsMatcher(this.HASH_ALGORITHM);
//		matcher.setHashIterations(this.HASH_INTERATIONS);
//		setCredentialsMatcher(matcher);
//	}

	/**
	 * 自定义Authentication对象，使得Subject除了携带用户的登录名外还可以携带更多信息.
	 */
	public static class ShiroUser implements Serializable {
		private static final long serialVersionUID = -1373760761780840081L;
		public String empno;
		public String loginName;
		public String name;

		public ShiroUser(String empno, String loginName, String name) {
			this.empno = empno;
			this.loginName = loginName;
			//this.name = name;
		}

		public String getName() {
			return name;
		}
		public String getLoginName() {
			return name;
		}
		/**
		 * 本函数输出将作为默认的<shiro:principal/>输出.
		 */
		@Override
		public String toString() {
			return loginName;
		}

		/**
		 * 重载hashCode,只计算loginName;
		 */
		@Override
		public int hashCode() {
			return Objects.hashCode(loginName);
		}

		/**
		 * 重载equals,只计算loginName;
		 */
		@Override
		public boolean equals(Object obj) {
			if (this == obj) {
				return true;
			}
			if (obj == null) {
				return false;
			}
			if (getClass() != obj.getClass()) {
				return false;
			}
			ShiroUser other = (ShiroUser) obj;
			if (loginName == null) {
				if (other.loginName != null) {
					return false;
				}
			} else if (!loginName.equals(other.loginName)) {
				return false;
			}
			return true;
		}
	}
}
